A double negative is usually produced by combining the negative form of verb (e.g., cannot, did not, have not) with a negative pronoun (e.g., nothing, nobody), a negative adverb (e.g., never, hardly) or a negative conjunction (e.g., neither/nor).
Examples:
I didn't see nothing.- I did not have neither her address nor her phone number.
- It wasn't uninteresting
- She is not unattractive.
A double negative gives the sentence a positive sense. (e.g., "I didn't see nothing" is similar in meaning to "I saw something.") A double negative is not always an error. The latter two examples, meaning "It was interesting." and "She is attractive.", are fine.
Example:
- I cannot say that I do not disagree with you.
(This brilliant quote by Groucho Marx can be considered a triple negative. If you follow it through logically, you'll find it means "I disagree with you".)
Interactive example:
Interactive example:
- She claims she has not seen neither Paul nor John since May.